# Enter your code here. Read input from STDIN. Print output to STDOUT
from itertools import product

# Input reading
k, m = map(int, input().split())  # k = number of lists, m = modulo value

# Read all lists
lists = []
for _ in range(k):
    data = list(map(int, input().split()))[1:]  # Skip the first number (size of list)
    lists.append(data)

# Calculate the maximum value of the function using itertools.product
max_value = 0
for combination in product(*lists):
    # Calculate the value for the current combination
    current_value = sum(x**2 for x in combination) % m
    # Update the maximum value
    max_value = max(max_value, current_value)

# Output the result
print(max_value)